Abstract
THE diagrams shown in Figs. 1 and 2 represent photographs obtained when X-rays were reflected on rock-salt and quartz. The spots lying on the left of the vertical line are due to the rays which have passed directly through the crystal, while those on the right are produced by reflected rays. It is easy to see from Fig. 2 that there are five spots due to the impact of the reflected rays. The middle spot and the two on the outside are more intense than the two others. The optical axis of the quartz specimen lies in this case in the plane of incidence forming an angle of 1′ with the surface of the crystal.
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HUPKA, E. Some Phenomena Connected with Reflected X-Rays. Nature 91, 267 (1913). https://doi.org/10.1038/091267d0
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DOI: https://doi.org/10.1038/091267d0
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